<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 箭头   利用边框和旋转 */
        .a {
            width: 50px;
            height: 50px;
            border-left: 1px solid #000;
            border-top: 1px solid #000;
            transform: rotate(-45deg);
        }


        /* 三角形 */
        /*   带边框的三角形可以写两个叠在一起 */
        .b {
            width: 0;
            height: 0;
            /* transparent透明色 */
            border: 50px solid rgba(0, 0, 0, 0);
            border-top-color: #000;
        }



        img {
            width: 200px;
            height: 200px;
            border-right: 1px solid #000;
            padding-right: 30px;
        }
    </style>
</head>

<body>

    <div class="a"></div>

    <div class="b"></div>

    <img src="https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/28c13d0d11b38ec17fa5d83bc6ba5912.jpg?w=632&h=340" alt="">

</body>

</html>